Author(s):
1. Tatjana Botić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Branka Kojić-Dugić, Rafinerija ulja Modriča, Republic of Srpska, Bosnia and Herzegovina
3. Vasilije Hamović, Institut za akrditovanje BiH, Federation of Bosnia and Herzegovina , Bosnia and Herzegovina
4. Pero Dugić, Faculty of Technology Banja Luka, Republic of Srpska, Bosnia and Herzegovina

Abstract